BERLIN (Reuters) - European countries are stretched to their limits in the refugee crisis and cannot take in any more new arrivals, French Prime Minister Manuel Valls was quoted as saying in a German newspaper on Wednesday.

Europe is grappling with its worst refugee crisis since World War Two. Germany so far has taken in the bulk of some 1 million people expected to arrive this year.

"We cannot accommodate any more refugees in Europe, that's not possible," Valls told the Sueddeutsche Zeitung, adding that tighter control of Europe's external borders would determine the fate of the European Union.

"If we don't do that, the people will say: Enough of Europe," Valls warned.

The comments were published only hours before German Chancellor Angela Merkel was scheduled to meet French President Francois Hollande in Paris.

Norwegian police have advised citizens to carry valid identity papers on all trips abroad, following a government decision to start border controls on Thursday.

The Police Directorate says Wednesday all travelers arriving or leaving the country, including to and from neighboring Sweden, Finland and Denmark, must have valid ID on them. The police agency also says people moving about in border regions should also carry proof of their identity.

The new regulations were announced after Sweden said it's tightening border controls because the refugee situation was getting out of control. They also apply to Nordic citizens who have enjoyed passport-free travel for decades.

Immigration officials estimate Norway can expect more than 33,000 refugees this year, a threefold increase over 2014.